Loading up the kiln for bisque firing

Can I add one more shelf? Can I fit one more item?  Hot mid summer is the time to bisque (first firing of pottery) my new creations.  Especially the ones using natural leaves to create its unique texture and shape.  This year, I have harvested some young leaves from a Rhubarb, a Kabocha pumpkin, and a Japanese cucumber plant.  All from our humble backyard garden.  Naturally, every item becomes a one and only unique piece with different sizes and shapes. So packing them in the kiln efficiently to max the load is like working to complete a 3D puzzle.